Fig. 4From: Perovskite quantum dots modulating upconversion nanomaterials for cancer early detectionsPreparation and characterization of UCNP@SiO2 + QDs composite materials. A TEM image of UCNP@SiO2 + QDs. B EDS energy spectra of UCNP@SiO2 + QDs. C N2 isothermal adsorption and desorption curves of UCNP@SiO2 and UCNP@SiO2 + QDs. D Pore size distributions of UCNP@SiO2 and UCNP@SiO2 + QDsBack to article page